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Eightfold Blessings of Amaterasu on the Weight Stone under the Sunlit Watery Heavens (水天日光天照八野鎮石,Suiten Nikkō Amaterasu Yano Shizu-Ishi?, localized as "Eightfold Blessing of Amaterasu") is a mirror that Tamamo-no-Mae wears on her body. It is the temporarily released form of the Weight Stone of Tamamo (玉藻鎮石,Tamamo no Shizu-Ishi?), a sacred regalia among sacred regalia, which was enshrined at Izumo after being brought from heaven by "Takehinateru no Mikoto." According to the descriptions of the Nihon Shoki, it was taken from Izumo at the order of the Imperial Court and then later enshrined at Kawachi. It possibly later came to be known as the Yata no Kagami, the divine repository of Amaterasu, and it is thought to be the prototype of the To-Kusa no Kan-Dakara (十種神宝,? lit. "Ten Kinds of Sacred Treasures") of the Mononobe clan, which holds the power to revitalize souls and life-force.[2][3]

The mirror levitates around Caster in battle, which she uses it to hit enemies in close combat. Once its function as a Noble Phantasm is activated, she summons a circle of levitating Ofuda surrounded by a number of glowing Torii, charges the mirror with energy, and stands in the middle of the circle to draw in the energy. The energy drawn in allows her to use her abilities without the need to expend any magical energy for a limited time. It is normally a divine treasure of the land of the dead, that can even bring the deceased back to life, but the Servant form of Caster hasn't been granted the authority to use that much power.[2] Otherwise, it could have been an EX rank Anti-World Noble Phantasm that has the range of covering a single country.[1]

To activate the Noble Phantasm, Caster recites the following incantation:

God who resides in Izumo.
Aesthetically certain,
Breath of the soul.
Residing in the mountains and watery heavens, Amaterasu.
Let this freely become the proof of purification.
Thy name is Weighted Stone of Tamamo.
Become the sacred treasure, Mirror of Uka!
Just kidding☆

01 - The Eightfold Blessing of Amaterasu
A mirror wielded by Tamamo-no-Mae. It is one of the sacred treasures brought down from the Heavens by the god Takehinateru-no-Mikoto and was oringally kept in the great shrine in the Izumo Province. According to passages in the Chronicles of Japan, the mirror was later moved to a site in the Kawachi district as the behest of the Imperial Court.

The mirror is also known as Yata-no-Kagami and is frequently used in rites honoring the sun goddess Amaterasu. In addition to its importance in ritual observances, it is also thought to possess the power to bring the dead back from the afterlife. However, since Caster's rebirth as a Servant, this power is no longer accessible.

02 - Maleficum
The Witchcraft that Caster uses is all physical phenomena performed with her own body. While common Magecraft are programs that "recompose what exists around," Witchcraft are programs that "recompose the raw materials in one's own body."

According to Caster's own word:

"This time there is only one due to the constrains of the Moon Cell, but originally I could produce a million troops from my multiple tails!"

That is really suspicious though.

03 - Red Lily of the Killing Stone of Nasu
This skill involves the use of the infamous Killing Stone of Nasu. After her death, Tamamo-no-Mae's spirit began to haunt the area around this stone and also imbued it with a terrible curse that killed any creature that came near it.

Originally located in the Nasu highlands of Tochigi Prefecture, the stone was shattered by a virtuous monk by the name of Gennou who then scattered the peces across three places in Japan.
It is believed that the shards of the rock evolved into fox spirits known in Japanese as kitsune and inukami. The legends go on to say that these newly-born spirits were bound as familiars by wizards powerful enough to establish contracts with the divine.

Territory Creation [C]
This skill allows one to create a reality tailored specifically to their skills as a magus.
Unfortunately for Tamamo-no-Mae, her personality is ill-suited for the task of manipulating reality and she has great difficulty even creating a small-scale crafting studio for creating minor amulets and other types of low-level talismans.

Maleficium [EX]
The sacred rituals of the Dakini goddesses. The rituals confer the abilities to perform such actions as foretell the time and place of one's death and manipulate the hearts and minds of both men and women. Due to a number of very harsh lessons impressed upon her in the past, Tamano-no-Mae no longer make use of her still formidable skills in these areas.

Transformation [A]
This refers to the abilities of either changing ones appearance or borrowing the physical form of another. As a kitsune, or fox spirit, Tamano-no-Mae is able to alter her appearance and even species at will. However, due to a traumatizing event in a past incarnation that resulted in her death and temporary damnation, she rarely, if ever, uses this ability.

01 - Character Background
In the final years of the Heian period, there was a beautiful courtesan in service to the Emperor Toba known as Tamamo-no-Mae. Born Misukume, she first entered the court as a servant at the age of 18, but quickly became a well-respected lady and a favorite of the emperor himself due to her incredible beauty and the depth of her intelligence.

While the stories become somewhat murky on this point, the most widely excepted theory is that an itinerant fortune teller visiting Emperor Toba's court discovered Tamamo-no-Mae's true identity as a nine-tailed fox spirit. Tamamo-no-Mae was denounced as the cause of the emperor's lingering illness and was driven out of the palace and onto the plains of Nasu, where she was killed trying to defend herself against an army of 80,000 soldiers sent by the emperor. While no one knows exactly what happened to her afterwards, it is believed that she was transformed into the legendary killing stone.

02 - "Dakini Deva"
While Tamano-no-Mae is generally believed to be a nine-tailed fox spirit with many of the attributes associated with the tantric deities known as Dankini, she is frequently mistaken by many as one of the Inari or sometimes even a manifestation of Buddha.

In the Fate/EXTRA universe, Tamamo-no-Mae is a soul that was created from the essence of the sun goddess Amaterasu, and as such is not merely a Earth spirit, but is actually a unique facet of the goddess from which she came. With this being said, it'd be a monumental mistake to classify her as one of the many human-spawned Legendary Souls.

However, she was willingly embraced the role of a Legendary Soul so that she could, in her own words "become a good wife." By deliberately accepting the limits inherent in the role of Servant, many of her original powers have been sealed away.

On a final note, as most deities are neither truly good nor evil, there are instances when Tamamo-no-Mae can be summoned as an evil spirit. Should this happen, she will transformed into a hideous monster capable of defeating a hundred heroes at once. In fact, when in this form, she is considered one of the Japan's Three Great Monsters.

Eightfold Blessings of Amaterasu on the Weight Stone under the Sunlit Watery Heavens [Noble Phantasm]
Suiten Nikkou Amaterasu Yano Shizu Ishi.
Sweets Heroic Spirit Cas-ko’s Noble Phantasm. She doesn’t use it much.
In EXTRA it is shown as a mirror, but it is actually the Tamamo Shizuishi, a sacred regalia among sacred regalia.
The Shizuishi was enshrined in Izumo, and it is a sacred treasure said to have been brought to Earth from Heaven by Takehideri no Mikoto, and is thought to be a shintai (object of worship) of the Great Gods of Izumo.
According to the Nihon Shoki, it was taken from Izumo at the request of the Imperial court and later enshrined in Kawachi.
It’s probably the Yata Mirror that came afterwards, the shintai of Amaterasu Oomikami.
The Shizuishi is thought to be the prototype of Mononobe’s Ten Sacred Treasures (Tokusa no Kandakara), and is said to have the power to revitalize the soul and life force and even revive the dead.
Since this is too cheat, in the game we made it just provide unlimited magical power.
Though this is another digression, the Ookuninushi that enshrines the Tamamo Shizuishi is basically the god of gods.
Despite Cas-ko's appearance, she is indeed a top rank Divine Spirit class Servant.